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This paper addresses the problem of AAA routing in roaming situations over heterogeneous wireless networks. While traveling, a mobile user often initiates an authentication process with the user's home network AAA server to use the resources of a remote network. In the process, the user wants to affect the selection of a roaming path to the user's home network, because pricing and other services differ by the path. It presents a network-based solution for the selection that eliminates the necessity of user's inquiring, collecting, and analyzing data over, possibly, heterogeneous wireless networks. The solution assists the user in selecting a roaming path with respect to a user-preferred metric and performing a mutual authentication afterward via the selected path.
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